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Johnson

Johnson Level & Tool 3878 Magnetic Professional Aluminum, 78", Black, 1 Level

  • Based on 329 reviews
Condition: New
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Availability: 13 left in stock
Fulfilled by American Tool Supply
Arrives Sep 29 – Oct 1
Order within 16 hours and 10 minutes
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Size: 78 Inch


Features

  • MAGNETIC LEVEL: The level features a strong holding magnetic edge that allows hand-free use on the ferrous metal surface for added convenience
  • QUALITY CONSTRUCTION: The carpenter's level features a heavy-duty aluminum frame that promises to withstand the harsh impacts at the job site; delivering unparalleled performance
  • ACRYLIC VIALS: The I-beam level features easy-read acrylic vials made of impact-resistant material for maximum durability
  • SMART DESIGN: The aluminum I-beam level has a top-read window that maximizes readability; allowing you to access reading from any angle
  • USER-FRIENDLY: The I-beam level has replaceable cover plates and vials that make it easy to use and a must-have for most professionals

Description

Johnson's 3800 I-beam level was designed to be durable and easy to use - so much so that it has been the standard in the industry for over 30 years. Its heavy duty aluminum frame ensures accuracy and is durable enough to withstand even the roughest jobsite abuse, and that frame is protected by shock absorbing end caps if the level is accidentally dropped. The level also comes equipped with replaceable, durable acrylic vials that are impact resistant along with a top read window allowing the user to stand over the work to view the vials. This level's strong magnetic edge provides hands- free use on ferrous metal surfaces. From the Manufacturer Extruded aluminum I-beam with black anodized finish. Computer machined level edge with strong, full-length magnetic strip. 360 degree reading acrylic yellow barrel vials. Screw-on, high-impact resistant plastic covers with protective lenses. Large, patented, magnified top-read window. Shock-protecting end caps. Frame dimensions: 1 In. x 2-1/4 In.

Brand: Johnson


Material: Acrylic, Aluminum, Metal


Color: Yellow


Product Dimensions: 48"L x 2.25"W


Style: 36 Inch


Brand Name: Johnson


UPC: 049448378609


Global Trade Identification Number: 09


Unit Count: 1 Count


Manufacturer: Johnson Level & Tool


Manufacturer Warranty Description: Lifetime Accuracy Warranty Johnson Level warrants this product against defects in material and workmanship for life. The company will replace or repair the product if it fails under normal use. Bent level frames void warranty. This warranty is limited to the repair or replacement of the product only.


Number of Items: 1


Included Components: Aluminum Level


Item Type Name: i-beam


Model Number: 3878


Manufacturer Part Number: 3878


Color: Yellow


Style Name: 36 Inch


Item Dimensions L x W: 48"L x 2.25"W


Material Type: Acrylic, Aluminum, Metal


Operation Mode: Manual


Level Measurement Type: bubble


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sep 29 – Oct 1

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews

    • Best 3’ level
Love this level. Perfect size for many jobs. Big enough for most projects but no so big that it’s a burden. The bubble is in the middle which is a great feature. Full straight edge on both sides unlike other levels.
Reviewed in the United States on September 24, 2025 by Alex B.
    • Nice level and features
Size: 24 Inch
Nice level. Level and magnetic strip on this level works fantastic. Using this when setting metal fence post in the ground to ensure they are plumb prior to setting the pole in cement. Just place the magnet side against the pole, and it will stay until you remove it. I currently use two levels for quicker evaluation of the position of the pole. ... show more
Reviewed in the United States on August 30, 2025 by Harry Fowler
    • Great tool to have in one’s kit, and good value for the money
This level appears to be manufactured with precision, and to be accurate and sturdy. I used it initially to assist in the relocation of a towel rack in one of my bathrooms that a guest had incorrectly used as grab bar, and pulled out of the wall. The old one had been sloppily or hastily installed anyway, and as a result, was not close to being level. With the aid of this tool, I marked the location for the screw holes 24 inches apart and reinstalled the rack perfectly level. I next used it to install a series of knob pulls on some kitchen cabinet drawers. Although I measured down from the lip of the drawer ends (2 per drawer) using a plastic template, I double checked and adjusted the drill holes very slightly with the level, to allow for the fact that the drawer itself was not perfectly horizontal. This way to the naked eye, the pulls looked perfectly lined up. The 3 foot length was perfect for both of these jobs, and was a size not readily available in retail stores. I’m a happy camper! ... show more
Reviewed in the United States on November 6, 2016 by Butch Simmz
    • Nice quality Affordable
Size: 24 Inch
Needed a level of this size decently made & affordable for a lot of DIY work & could not afford ones with earth magnets even though that level of constructor’s grade would be very nice Nicely made & has a good feel to it to use
Reviewed in the United States on November 5, 2023 by Amazon Customer
    • Great level
The level was just as described. I like the black finish, and it really seems like it's put together well. Good brand and a good product. My testing showed it to be square and true. The packaging sucked, with no cushioning, but I complained elsewhere. Hope to have this level for a long time...
Reviewed in the United States on August 12, 2010 by B. Carroll
    • Made in the USA
I was looking for a decent quality 36" level that wasn't made in China and really didn't want to pay for a Stabila or Sola level. I somehow stumbled across this level that is made in the USA and for $27. It's lightweight aluminum I-beam body makes it very light and the magnetic is strong enough to hold itself to any ferrous metal. The vials are easy to read. I recommend this level who wants a quality level and doesn't like supporting slave labor in China. ... show more
Reviewed in the United States on December 15, 2020 by Indiana Annie
    • Great Level, Mildly Magnetic
I purchased the level for the purpose of installing a 30 in. safety/grab bar horizontally in a shower stall that is too small to use my 48 in. level. For this purpose it worked perfectly. I found the magnetic function to be only "mildly" magnetic IMO.
Reviewed in the United States on February 12, 2022 by Brian M.
    • The good, and the not so good.
Good low priced 8 foot level The good: It's cheap. You can read the levels from the top. The bad: It is straight, but easily bends.The magnetic strip is basically the same thing as they use to stick stuff to your refrigerator, which makes using the magnetic side of the level iffy as far as flatness is concerned, but just happens to be the side the level has to sit on to read the two top bubbles. When using this side on metal, it will suck down the level to whatever contour (within reason) it is attached to, and make the other (non magnetic) side follow suit. If I could do it over again, I would not. ... show more
Reviewed in the United States on December 12, 2015 by GearJunky

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